modules/nixos/multimedia/web/firefox/preferences.nix

@@ -1,9 +1,8 @@
 let
   mkPreferences = prefs: builtins.concatStringsSep
     "\n"
-    (map
-      (p: ''user_pref("${p}", ${builtins.toJSON prefs.${p}});'')
-      (builtins.attrNames prefs));
+    (builtins.mapAttrs
+      (name: value: "user_pref(\"${name}\", \"${value}\");"));
 in 
   mkPreferences {
     prefs = {